[FLINK] Change EventType from OTHER to RUNNING for running jobs

[mzareba382]

Problem

Within Flink integration, running jobs are sending events of type 'OTHER'. We should have an EventType with a name that clearly suggests that the event is currently running.

Solution

This change makes use of newly introduced 'RUNNING' EventType, which is a part of OpenLineage specification now and changes events from running Flink job to be of this type.

Related to: #972
Closes: #946

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